A8L Quattro Sedan W12-6.0L (BSB) (2005)
Checking voltage supply
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Connect multimeter to the following connector terminals for voltage measurement.
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Terminal 1 + Ground
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Terminal 1 +5
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Terminal 2 + Ground
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Terminal 2 + 3
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Specified values: at least 4.5 V
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Switch ignition off.
If specifications are not obtained:
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Check wires to control module according to wiring diagram.
Check wires to control module
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Connect test box to Engine Control Module (ECM) 2 (J623) wiring harness on connecting test box for wiring test.
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Check wires between test box and 6-pin connector for open circuit according to wiring diagram.
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Terminal 1+Socket 72
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Terminal 2+Socket 73
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Terminal 3+Socket 36
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Terminal 4+Socket 35
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Terminal 5+Socket 33
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Terminal 6+Socket 34
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Wiring resistance: max. 1.5 ohms